What is the ideal room ambience lighting level?

[yalag]

I just tried to calibrate my monitor with a colormunki display and it tried to detect my ambient lighting and got 55.12 lux and recommended to set the monitor to 80 cd/m2. Is this a good lighting environment for photographic work?

[rubencarmona]

Yes absolutely. The recommended lightning environment is one where your colorimeter will suggest you from 80 to 120 cd/m2. 

[digitaldog]

Lower is always better, you can't go too low. Any ambient light that strikes the display has a visual effect on black.
As for 80cd/m2, that value is based on how you view your prints and how well you expect a visual match between the display and that print. There is no correct value! Anyone who suggests a value for cd/m2 without taking print viewing conditions in mind is much like one hand clapping; the values provided are meaningless. Lower is better to a point (the display will last longer of course). So if you are not trying to match display to a print, go low. That said, modern LCD displays are hard pressed to be driven that low natively meaning there's some LUT or adjustment happening instead of the native backlight being lowered and that can cause banding on-screen.

See: http://www.luminous-landscape.com/tutorials/why_are_my_prints_too_dark.shtml